单项选择题

Modern plastics can （）very high and very low temperatures.

A. stand
B. hold
C. carry
D. support

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单项选择题
He spent（）collecting materials for his article.

A. a half year
B. half year
C. half a year
D. half of a year
单项选择题
You ought （）the matter to the manager the day before yesterday.

A. to report
B. to have reported
C. to reporting
D. have reported
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